Re: [Sip] draft-ietf-sip-outbound

["Elwell, John" <john.elwell at siemens.com>]

Juha,
 

> -----Original Message-----
> From: sip-bounces at ietf.org [mailto:sip-bounces at ietf.org] On 
> Behalf Of Juha Heinanen
> Sent: 11 May 2008 12:57
> To: Christer Holmberg
> Cc: sip at ietf.org; Francois Audet; drage at alcatel-lucent.com; 
> dean.willis at softarmor.com
> Subject: Re: [Sip] draft-ietf-sip-outbound
> 
> Christer Holmberg writes:
> 
>  > But, that still doesn't mean that the UA has to register with every
>  > edge proxy it is aware of.
> 
> i have been fighting this battle in order to make very simple
> implementation possible of what i consider a COMMON case.  this common
> case is the one where a SINGLE HOST has enough processing 
> power to serve
> as a sip proxy/registrar of the user community, such as a good size
> enterprise or even a small voip provider.
> 
> the only problem with this single host implementation of 
> proxy/registrar
> is lack of redundancy.  this problem could be trivially 
> solved by adding
> a second sip/proxy registrar that could run independently 
> from the first
> if we could assume that each UA would setup flow and register 
> with BOTH
> of these proxy/registrars when configured with an ob proxy set
> consisting of two URIs matching these two proxy/registrars.
> 
> so i would like to propose that ob draft mandates UA to set 
> up flows and
> register with AT LEAST TWO ob proxies if ob proxy set is bigger than
> one.  second paragraph of 4.2.1. Initial Registrations could then go
> like this:
> 
>   For each outbound proxy URI in the set, the UAC SHOULD send a
>   REGISTER request using this URI as the default outbound 
> proxy.  If the
>   set has more than one URI, the UAC MUST send a REGISTER 
> request using at
>   least two of them as the default outbound proxy.
[JRE] Or alternatively, why not mandate that a UA has to be able to be
configured with an outbound proxy set of between 1 and n entries, where
n must not be less than two, and that the UA must be able to register
with each of the outbound proxies in its configured set? I see no
purpose in a UA being able to be configured with 5, say, entries in its
set if it is never going to register with more than 2.

John


> 
> this would make the above described trial implementation of 
> common case
> possible and at the same time would support whatever more complicated
> scenarios and also the simple scenario where there is only 
> one ob proxy
> in the set.
> 
> -- juha
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